Mmm, in such an economically globalized world as we're in these days, playing isolationist is just going to hurt, especially when you don't have anything particular of your own to fall back on, such as industry or natural resources. Services can be done just about anywhere, and you'd be out-competed by places who can do it more cheaply/efficiently. This was easier in the past – e.g. in Australia from the end of WW II to the 70s, tariffs on imports were quite substantial, while on home products they weren't, so local industries benefited a good deal: they were effectively protected, able to develop their products and command portions of the market. But production/consumption dynamics and economic philosophies have changed globally since that time, so this concept doesn't apply so much.
Moreover, there are so many regulations and interconnections governing trade, movement of goods, and so on, that reconfiguring them and/or making new ones which will work is a massive task that takes years (as an example, the Canada-EU trade deal which came into effect in some years ago took six years to negotiate).
So, for us pickers what does this mean? If you want parts and hardware, better save up for a lathe/milling machine *puts on Priest's 'British Steel'*
Rich, do you get many orders from the UK? As you've raised this discussion, I imagine you do get a consistent number.